Overloaded scripts (too many lines)

Hello. This question just came up to my mind and some quick googling didn’t deliver an answer, but I want to learn about script handling and organisation.
So, can a C# scripts be “overloaded”, where I mean too long so it starts becoming an issue? I have some scripts, like for the inventory handling, that has over 600 lines of code distributed over 7 functions (and I keep adding new functions to it). I can work well with, I used a lot of time to split it into practical methods to keep it clear and easy to work with. But how about unity? Is there a limit for example the update function (it has 150 lines right now) where the code is getting too long and will be a burden?

No, long functions or scripts are not an issue for Unity. They may be problematic for you as the programmer because they may be difficult to navigate but Unity doesn’t care.